双级对转压气机流场分析研究

以设计的某对转压气机级为研究对象,应用F INE/TURBO和CFX软件研究了设计转速、典型工作状态下该压气机的性能和流场细微结构,为进一步优化对转压气机叶片设计提供了依据。计算结果表明:在压气机中反向旋转转子叶片布局设计较好的前提下,对转技术可以在较小的空间里实现较高的压比,从而大幅度提高发动机的推重比;文中给出的对转压气机设计局部流场结构还未达到最优,三维叶片还需要进一步改进,主要表现在一级转子根部和尖部附面层较厚,并伴随有分离现象;二级转子尖部分离流动强烈,使得下游叶片来流发生较大畸变;出口导叶设计尚不理想,集中表现为在根部和尖部有较弱的分离流。

Flow Field Investigation of Dual Stage Counter-Rotating Compressor

To our best knowledge,even in the rare papers in open literature concerning counter-rotating compressor,we have not found detailed technical information about its flow field.Our aim is to present the results of our effort at developing such information for a dual stage counter-rotating compressor,which we have investigated by numerical simulation.In designing and optimizing counterrotating compressor blade,we needed the performance and detailed flow structure of counter-rotating compressor under design rotating speed and typical working condition;we obtained what we needed with two kinds of commercial software:(1) NUMECA solver FINE/Turbo,(2) CFX.Numerical results show preliminarily that the p-(pressure ratio p vs mass flow rate ) performance curves in Fig.1 of the full paper obtained with the above-mentioned two kinds of software show good agreement.The p- curve shows further preliminarily that counter rotating technique is effective in raising the pressure ratio in a well laid out very limited space, thus raising the weight-thrust ratio of aero-engine.